Uveal melanoma (UVM) is the most prevalent primary intraocular malignancy and is known for its poor prognosis and resistance to existing therapies. This study explores the role of OTULIN, a deubiquitinating enzyme, in the pathogenesis of UVM by modulating tumor cell dynamics via its interaction with Immunoglobulin Superfamily Member 11 (IGSF11). We show that OTULIN forms a direct interaction with IGSF11, stabilizing it by cleaving its attached ubiquitin chains and thus preventing its proteasomal degradation. This stabilization significantly boosts UVM cell proliferation, migration, and invasion, while simultaneously reducing apoptosis. These effects collectively enhance tumor aggressiveness and the potential for metastasis. Furthermore, our findings reveal an epigenetic regulation mechanism wherein TET3 controls OTULIN expression by modifying methylation patterns, thereby connecting DNA methylation status with the ubiquitin-proteasome pathway in cancer. Overall, this study not only advances our understanding of the molecular dynamics driving UVM but also positions the OTULIN-IGSF11 axis as a promising new target for therapeutic intervention, potentially leading to more effective treatments for this challenging cancer.